P2765

Input/Turbine Shaft Speed Sensor B Circuit

Q: Is it safe to drive with P2765?

Short, gentle trips may be okay, but without a valid input-speed signal the transmission can shift poorly or drop into limp mode. Have it diagnosed before long drives.

Q: Can I just clear P2765?

It will clear, but a circuit or sensor fault returns quickly. Repair the wiring or replace the sensor instead of only resetting it.

Automatic transmission Generic OBD-II Medium

What it means

P2765 means the TCM detected a fault in the "B" input/turbine shaft speed sensor circuit — the sensor that measures how fast the transmission's input (turbine) shaft is turning so it can time and control shifts. Without a valid signal, shifts can turn harsh or the transmission may go into limp mode. The engine still starts and runs; the causes are usually a wiring/connector fault or a failed sensor.

Medium

Can I keep driving? The engine starts and runs, but the transmission may shift harshly, hold a gear, or enter limp mode without a valid input-speed signal. Drive gently and get it checked.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Harsh, delayed, or incorrect shifting
Transmission stuck in one gear or in limp mode
Erratic shift timing or a dropping speedometer

Common causes

Most likely first

Open, short, or high resistance in the input/turbine shaft speed sensor 'B' circuitLikely
Corroded, loose, or damaged sensor connectorCommon
Failed input/turbine shaft speed sensorCommon
Debris on the sensor tip or a damaged tone/reluctor ringLess often
Chafed or broken wiring in the sensor harnessLess often

How to diagnose & fix

Work through it in order

Read freeze-frame data and inspect the sensor connector and wiring for damage or corrosion.
Check the sensor tip for metal debris and inspect the tone ring.
Measure the sensor's resistance and signal against spec.
Replace the input/turbine speed sensor if it's out of spec, then clear the code.
Road-test to confirm normal shifting and a stable input-speed signal.

FAQ

Quick answers

Is it safe to drive with P2765?+

Short, gentle trips may be okay, but without a valid input-speed signal the transmission can shift poorly or drop into limp mode. Have it diagnosed before long drives.

Can I just clear P2765?+

It will clear, but a circuit or sensor fault returns quickly. Repair the wiring or replace the sensor instead of only resetting it.

Read & clear P2765 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX